AirHint found the following cheapest return flights from Sydney (SYD) to Lisbon (LIS) in August 2025 (see full year).

Return flights

03 Aug - 14 Sep	Air China
19 Aug - 09 Sep	China Eastern
04 Aug - 25 Aug	China Eastern
18 Aug - 31 Aug	China Eastern
06 Aug - 08 Sep	China Eastern
08 Aug - 17 Aug	Air China
26 Aug - 06 Sep	Hainan Airlines
08 Aug - 29 Aug	Air China
03 Aug - 24 Aug	China Eastern
01 Aug - 29 Aug	Air China
14 Aug - 21 Aug	China Eastern
08 Aug - 24 Aug	China Eastern
08 Aug - 05 Sep	China Eastern
11 Aug - 21 Aug	Air China
01 Aug - 31 Aug	China Eastern
18 Aug - 01 Sep	China Eastern
25 Aug - 07 Sep	Etihad Airways
07 Aug - 01 Sep	China Southern
07 Aug - 09 Sep	China Southern
21 Aug - 04 Sep	China Eastern

Also check the deals for one-way flights from Sydney to Lisbon in August.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Sydney to Lisbon in August from 792€

Return flights